Wood-pulp-grinding machine



(No Model.) 2 Sheets-Sheet 1.

LTROMBLEE. WOOD PULP GRINDING MACHINE.

No. 597,208. Patented Jan; 11, 1898..

No Model.) 2 Sheets-Sheet 2.

A. TROMBLEE.

WOOD PULP GRINDING MACHINE. v No. 597.208. Patented Jan. 11, 1898.

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UNITED STATES PATENT rricn.

ANDREW TROMBLEE, OF PORT HENRY, NEXV YORK.

WOOD-PULP-GRINDING MACHlNE.

SPECIFICATION forming part of Letters Patent No. 597,208, dated January 1 1, 1898. Application filed August 4, 1897. $erial No. 647,066. (No model.)

To all whom it may concern.-

Be it known that I, ANDREW TROMBLEE, a citizen of the United States of America, residing at Port Henry, in the county of Essex and State of New York, have invented new and usefullmprovements in Wood-Pulp-Grinding Machines, of which the following is a specification.

This invention relates to wood-pulp grinders, and has for its object the improvement in the application of the hydraulic power to the pistons which force the blocks of wood against the revolving stone on which they are ground into pulp, whereby a uniform pressure is always maintained on said stone, Whose normal speed thus remains constant and consequently the product thereof of uniform fineness; and the invention consists in the construction and arrangement of the pipes and valves conveying water to and from the various operating-cylinders, all as set forth in the following specification and pointed out in the claims.

In the drawings forming part of this specification, Figure'l represents a side elevation of a pulp-grinder having this invention applied thereto. Fig. 2 is a vertical section on line 2 2 of Fig. 1 through the auxiliary cylinder of the machine. cross-section through the cylinder-valve on line 3 3, Fig. 2. Fig. 4 is a section of one of the high-pressure valves on line at 4, Fig. 1.

Referring to the drawings, A represents the frame of a pulp-grinding machine of a well-known type inclosing a grindstone B. Secured to the frame A and arranged radially thereon as regards the grindstone are the iron pockets 0 of suitable form, above which are arranged suitable operative cylinders D D, the pistons D of which, actuated by hydraulic pressure, force the blocks of wood in the said pockets against the face of the said grindstone. An auxiliary cylinder E, located between the cylinders D D, is brought into use only when one of the side cylinders is thrown out of action for recharging its pocket 0 with wood. Said auxiliary cylinder is provided with a pocket C similar to said pockets 0. This construction is well known and forms no part of this invention.

In the above construction the operative cylinders are the two side cylinders D D, the

Fig. 3 is an enlargedcentral or auxiliary cylinder E being held in reserve With a charge of wood in the pocket thereof, but with no pressure on the piston. hen it is desired to recharge one of the side pockets 0, this central cylinder is brought into action in order to keep the proper resist ance on the grindstone l3 and prevent its racing, as it is called, by reason of the removal of one-half of the load under which the stone normally runs, as the said racing of the stones not only operates against a uniform product of the particular grinder involved, but many grinding-machines being located on the main shaft F the speed of all of them is affected by whatever cause affects one of them. Therefore the first essential of a uniform product is a uniform speed for the grindstone.

The method in common use for bringing the auxiliary cylinder into action when it becomes necessary to recharge one of the side cylinders is unsatisfactory on account of the fact that the operations of shutting the pressure off from one of said side cylinders and turning it into the auxiliary cylinder are separate operations and more or less delay occurs between the said two operations, resulting in an acceleration in the speed of the stone, and hence non-uniformity of product. When there are a number of stones on one shaft, which is the common form of arrangement, the recharging of one of the pockets 0 occurs frequently, and as a variation in speed occurs at each recharging of any pocket on any machine on the main shaft it follows that wide variation in the fineness of the product must and does result therefrom.

By the use of this invention the above defects of the pulp-grinders are entirely done away with, and the operation of turning the Water-pressure off from one of the side cylinders turns it into the auxiliary cylinder at the same time, thus keeping a uniform pressure on the stone. Means are also provided for raising any one of the pistons to a suitable position for recharging the pocket under it after the high pressure has been turned off therefrom and turned into another cylinder.

The pipe construction for accomplishing the above-described operations is as follows: Two main pipes 2 and 3 represent pipes for conducting water under high pressure and low pressure, respectively. These pipes are usually supplied with water from stand-pipes of suitable height, A high-pressure pipe textends from one side cylinder to theauxiliary cylinder and from thence to the other side cylinder, connections being made to each of said cylinders for forcing the pistons thereof downward against the wood placed in the pockets C. One of these pistons is shown in operative position in Fig. 2. Connection from thesaid high-pressure main pipe 2 to the highpressure pipe 4: is made on one sideof the machine through the valve a and on the opposite side thereof through the valve 12, a branch 5 from the said main pipe 2 below said valve to leading over to the said valve b. The valves a and b are three-way valves, a cross-section of one of them being shown in Fig. t. By means of these valves the high pressure may be turned off from the pipe 4: altogether or be turned into the side cylinders D D to operate their pistons, as described, or turned off from either one and turned into the auxiliary cylinder E to operate its piston. The connections from the pipe 4 to the side cylinders D D are made through valves (1 and f, and extending from said valves are the two waste-pipes ahthrough which the water which has been used to operate the pistons D of the cylinders DD escapes when the valve d orf has been operated to shut off the high pressure from the pipe 4 and the low pressure from the main pipe 3 has beenturned into the opposite end of said side cylinders D D toraise the pistons for the purpose of recharging the pockets 0 with wood. Said waste-pipe 4: also serves as a waste for the water in the lower end of the cylinder which has been used for raising the piston and which must be let out before the piston can again be operated by the high pressure.

Connection is made from the low-pressure main pipe 3 to the auxiliary cylinder E direct from a T 6 on the end of said pipe 3, and from another T 7 in said pipe near its upper end a branch 3 extends across the machine and is connected to the pipe 4 by the T 8, between the valve a and the valve cl. Connection from said T 8 with the cylinder D is made in the same manner as with the cylinder D,

viz: by entering the pipe 4 by means of a T 9, located between the valve 7) and the valve f.

Connection with the low-pressure main pipe 3 with the auxiliary cylinder E, above described, is made through the valve m, which is similar to the valves d and f and a crosssection of which is shown in Fig. 3. Extendin from said valve 177. is a waste-pipe 3,which, like the waste-pipes at, serves as an exhaustpipe for either end of the cylinder.

Just back of the point where connection is made between the low-pressure main pipe 3 and the pipe 4 through the Ts 8 and 9 two check-valves 10 and 12 are located to prevent the high-pressure water of pipe 4: from entering the main pipe 3. A valve 14: is located in the low-pressure main pipe 3 near the auxiltwoside cylinders D D.

.iary cylinder, which is closed before the highpressure water is admitted to the upper end of said cylinders. The purpose'and method of operating this valve will be described farther on.

By the manipulation of the valves d, m, or f, which are. similar in construction, water maybe conducted from the pipe 4 to the upper side'of the piston, from the latter outward through the waste-pipe r, or water may be conducted to the under side of the cylinder and from the latter out through the waste. These valves may be of any one of the com mon four-way constructions.

The operation of the above-described improvements is as follows: Assuming that the 7 machine is" in operation, the valves a b will be open so as to admit high-pressure water. into the pipe 4, between said valves and the The valves dand f on said last-named cylinders will be so set that the water in the pipe 4, abovementioned, will he admitted to the upper side of the pistons of said cylinders, thereby forcing the wood in the pockets under said cylinders against the face of the grindstone B. WVith these valves open the check-valves 10 and 12 close the pipe 3 and its branch 3 against the entrance of water therein from the high-pressure line. The auxiliary cylinder E will have its pocket 0 also charged with wood, the valve 14 will be closed, and the wood in said pocket will rest on the grindstone, but having bearing upon it only the weight of the piston and the water in the upper end of the cylinder, which has been previously filled from the lowpressure pipe 3 by proper manipulation of the valve m after the pocket has been charged. After socharging the pocket of the auxiliary cylinder and filling the upper end of the latter with water the valve 14 is closed. Now when the pocket of one of the side cylinders D, for example-is to be recharged with wood, then the valves a and d are simultaneously operatedthc valve a so as to shut off the high-pressure water from the cylinder D and turn it into that portion of the pipe 4 leading to the cylinder E and the valve d so operated as to open the waste-pipe 4, so that the high-pressure water in the upper end of the side cylinder D may escape and the lowpressure water from the main pipe 3 through thebranch 3" may enter the cylinderD against the under side of its piston, forcing the latter to the outer or upper end thereof. The pocket C of the said cylinder D may then be recharged with wood, after which the valve d is operated to open the waste-pipe 4 to permit the exit of water from the lower end thereof and to admit water from low-pressure pipe 3 into the upper end thereof for filling it and to bring the piston to bear on the charge of wood just put into the pocket. This being done, the valve or is operated to shut the high-pressure water off from the auxiliary cylinder E and turn it into the cylinder D, the valve cl having been left by its last manipulation in proper position to admit said water to the upper end thereof.

A further important object attained by this construction and application of water-pipes to pulp-grinders is that the high-pressure supply is never drawn on to fill the cylinders,

and hence the normal level of water in the high-pressure stand-pipe does not change appreciably, and a uniform pressure on the various pistons supplied from the one head of water common to them all is thus easily maintained and the pulp product of the machines is of uniform fineness.

It will be seen. from the above description that there is no appreciable lapse of time between the moment of cutting off the pressure from the side cylinder D and applying it to the auxiliary cylinder E when the pocket of said first-named cylinder is to be charged, and the same is true when the pressure is, after said recharging operation, shut off from the cylinder E and turned onto the side cylinder D.

It is apparent that one operating-cylinder only could be used in connection with an auxiliary cylinder instead of the construction shown and described, or, if desired, three operating-cylinders and one auxiliary could be employed; but in practice it has been found that the grinding capacity of the stone is best adapted to the use of two cylinders and one auxiliary, as herein set forth.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a wood-pulp-grinding machine, the combination with an operating-cylinder, and an auxiliary cylinder, and suitable valve-controlled waste-pipes therefor, of a main highpressure water-pipe, a water-pipe between said operating and auxiliary cylinders for conveying water to the upper side of the pistons thereof for moving them in one direction, a connection from said main pipe to said pipe between the said cylinders, a valve in the said last-named pipe controlling the water from said'main pipe, and by means of which said water is diverted to said auxiliary cylinder simultaneously with the shutting off of the same from said operating-cylinder, and vice versa, and means for moving said pistons in a direction opposite to that imparted by said high-pressure pipe connections, substantially as set forth.

2. In a wood-pulpgrinding machine, in combination, two operating-cylinders and a non-operating auxiliary cylinder, and suitable valve-controlled waste-pipes therefor, a main high-pressure water-pipe, a pipe conmeeting together all of said cylinders for operating their pistons in one direction, suitable valve connections between said main pipe and said cylinder-connecting pipe,whereby, when one of said valves is operated to shut the water off from an operating-cylinder, it simultaneously diverts it to said auxiliary cylinder, and a low-pressure waste-pipe having valve-controlled connections with said cylinders for moving the pistons thereof in a direction opposite to that imparted by said high pressure water, substantially as described.

3. In a wood-pulp-grinding machine in combination with the operating-cylinders thereof and a non-operating auxiliary cylinder, all having suitable"valve-controlled waste-pipes, of high-pressure water-pipe connections between said cylinders for moving the pistons thereof toward the grindstone of said machine, low-pressure Water-pipe connections between said cylinders for moving the pistons thereof in a direction opposite to that which said highpressure water-imparts, a valve in said highpressure pipe whereby, when water is shut off from one of said operating-cylinders, it is diverted simultaneously to said auxiliary cylinder, valves on. said cylinders for providing free exit for water contained in either end thereof simultaneously with free entrance of water under pressure to the opposite end thereof, and check-valves in said low-pressure pipes, all as and for the purpose described.

ANDREW TROMBLEE. Witnesses:

JOHN R. EDWARDS, HARRY D. Srrcnn. 

